I quess u want to know which query string has come and from which page u
have been redirected
one way to know from which page u have been redirected is
Request.UrlReferrer.AbsolutePath;
otherwise
u can check values are not null like this
if((Request.QueryString["a"]!="")&&(Request.QueryString["a"]!=null)
{
string x=Request.QueryString["a"]
}
"Arvan" <es***@126.com> wrote in message
news:OB**************@TK2MSFTNGP03.phx.gbl...
there is 3 links to page default.aspx,and each one has a querystring,like
a=1, b=1 ,c=1.
problem is how do i ensure the name of querystring!
how do?